For lineage pieces like ASD Holy Grail, did you get any paperwork or evidence of lineage? I asked a few online vendors for lineage, and they really don't have any besides saying they bought it from person A at store A. I guess anyone can say that though. What are your thoughts on lineage pieces and authenticity?
There is none. All that you can expect is that the person is the original buyer and has their invoice/receipt.
Very rarely will it pass further than that.